private void InternalDrawImage(BlitFast blit, int x, int y,
int srcx, int srcy, int srcwidth, int srcheight)
{
if (x < 0)
{
srcx += x;
srcwidth += x;
x = 0;
}
if (y < 0)
{
srcy += y;
srcheight += y;
y = 0;
}
if (srcx < 0)
{
srcwidth += srcx;
srcx = 0;
}
if (srcy < 0)
{
srcheight += srcy;
srcy = 0;
}
if (srcwidth <= 0 || srcheight <= 0)
{
return;
}
if (srcx + srcwidth > _bitmapData.Width)
{
srcwidth = _bitmapData.Width - srcx;
}
if (srcy + srcheight > _bitmapData.Height)
{
srcheight = _bitmapData.Height - srcy;
}
if (srcwidth <= 0 || srcheight <= 0)
{
return;
}
var blockLenght = srcwidth * blit._bpp / 8;
if (_bitmapData.Stride == blit._bitmapData.Stride)
{
var ptrdst = _bitmapData.Scan0 + y * blockLenght;
blit.Lock();
var ptrsrc = blit._bitmapData.Scan0 + srcy * blockLenght;
var count = (uint)(srcheight * blockLenght);
CopyMemory(ptrdst, ptrsrc, count);
}
else
{
var ptrdst = _bitmapData.Scan0 + x * _bpp / 8 + y * _bitmapData.Stride;
var ptrsrc = blit._bitmapData.Scan0 + srcx * _bpp / 8 + srcy * blit._bitmapData.Stride;
var stridedst = _bitmapData.Stride;
var stridesrc = blit._bitmapData.Stride;
switch (blockLenght)
{
case 128:
CopyMemory128(ptrdst, ptrsrc, stridedst, stridesrc, srcheight);
break;
case 64:
CopyMemory64(ptrdst, ptrsrc, stridedst, stridesrc, srcheight);
break;
case 32:
CopyMemory32(ptrdst, ptrsrc, stridedst, stridesrc, srcheight);
break;
case 16:
CopyMemory16(ptrdst, ptrsrc, stridedst, stridesrc, srcheight);
break;
case 8:
CopyMemory8(ptrdst, ptrsrc, stridedst, stridesrc, srcheight);
break;
case 4:
CopyMemory4(ptrdst, ptrsrc, stridedst, stridesrc, srcheight);
break;
default:
CopyMemory(ptrdst, ptrsrc, (uint)blockLenght,
stridedst, stridesrc, srcheight);
break;
}
}
}
private unsafe void InternalDrawImageAlpha(BlitFast blit, int x, int y,
int srcx, int srcy, int srcwidth, int srcheight)
{
if (x < 0)
{
srcx += x;
srcwidth += x;
x = 0;
}
if (y < 0)
{
srcy += y;
srcheight += y;
y = 0;
}
if (srcx < 0)
{
srcwidth += srcx;
srcx = 0;
}
if (srcy < 0)
{
srcheight += srcy;
srcy = 0;
}
if (srcx + srcwidth > _bitmapData.Width)
{
srcwidth = _bitmapData.Width - srcx;
}
if (srcy + srcheight > _bitmapData.Height)
{
srcheight = _bitmapData.Height - srcy;
}
blit.Lock();
// Divido per 4 perché è un 32bpp
var blockLenght = srcwidth * blit._bpp / 8 / 4;
var ptrdst = _bitmapData.Scan0 + x * _bpp / 8 + y * _bitmapData.Stride;
var ptrsrc = blit._bitmapData.Scan0 + srcx * _bpp / 8 + srcy * blit._bitmapData.Stride;
var stridedst = _bitmapData.Stride;
var stridesrc = blit._bitmapData.Stride;
for (var i = 0; i < srcheight; i++)
{
var dst = (byte *)ptrdst;
var src = (byte *)ptrsrc;
for (var j = 0; j < blockLenght; j++)
{
var a = src[3];
if (a > 0)
{
if (a == 0xFF)
{
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst[3] = src[3];
}
else
{
dst[0] = InterpolateByteColor(src[0], dst[0], a);
dst[1] = InterpolateByteColor(src[1], dst[1], a);
dst[2] = InterpolateByteColor(src[2], dst[2], a);
if (dst[3] < a)
{
dst[3] = a;
}
}
}
dst += 4;
src += 4;
}
ptrdst += stridedst;
ptrsrc += stridesrc;
}
}